pub fn dilate(mask: &[bool], width: u32, height: u32, radius: u32) -> Vec<bool>Expand description
Morphological dilation of a boolean mask.
Expands true pixels by radius in all directions using separable
box dilation (horizontal pass then vertical pass). O(n) per pass
regardless of radius.
The dilated mask is used for clustering only — original mask is preserved for accurate pixel statistics.